05000361/LER-1982-123, Forwards LER 82-123/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-123/03L-0.Detailed Event Analysis Submitted

ML20065T188
Person / Time
Site:	San Onofre
Issue date:	10/22/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20065T190	List: 05000361/LER-1982-123, Forwards LER 82-123/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-123-03, /03L-0:on 820922,while in Mode 2,condensate Storage Tank T-120 Water Level Fell Below Tech Spec Limit, Rendering Tank Inoperable.Caused by Inadequate Makeup Water Control.Better pre-planning on Water Usage Discussed
References
NUDOCS 8211020258
Download: ML20065T188 (2)

LER-1982-123, Forwards LER 82-123/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982123R00 - NRC Website

text

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Wa c;CE Southern California Edison Company OCT y

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trLee<oNE ST ATION M AN AQt a (Ple) 492 7 700 October 22, 1982 U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:

Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject:

Docket No. 50-361 30-Day Report Licensee Event Report No.82-123 San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H. B. Ray (SCE) to R.,H. Engelken (NRC),

dated October 1, 1982.

The referenced letter included Licensee Event Reports (LER's) for three' similar occurrences involving Condensate Stcrage Tank T-120 low water level.

An event similar to these occurrences took,21 ace on September 22, 1982.

This most recent event is the subject of this letter and the enclosed LER.

Pursuant to Section 6.9.1.13b of Appendix A, Technical Specifications to Operating License NPF-10, for San Onofre Unit 2, this submittal provides the required 30-day written report and copy of LER 82-123 for this occurrence.

Limiting Condition for Operation (LCO) 3.7.1.3 requires the Condensate Storage Tank T-120 to be operable in Modes 1, 2 and 3 with a contained water volume'of at least 280,000 gallons. On September 22, 1982 at 0650 while in Mode 2, the water level in Condensate Storage Tank T-120 dropped below this required limit, the tank was declared inoperable, and the Action Statement associated with LCO 3.7.1.3 was entered. This Action Statement requires the inoperable tank to be returned to service within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or cooldown must be initiated.

DO K 05h0hhh PDR M 'M 82.3 70

9 Mr. R. H. Engelken october 22, 1982 The cause of this incident was similar to the referenced events, that is insufficient attention being directed toward maintenance of the minimum water volume during operations involving high water usage.

Corrective measures to restore water level were in progress prior to the level falling below the required limit, however, these measures were not sufficient to prevent the level from dropping below the limit for approximately 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />, at which time the level was restored to the required limit and the LCO again satisfied.

Corrective measures to prevent recurrence as stated in the referenced letter were discussed after this fourth occurrence among all SRO's and RO's and include increased attention to pre planning to anticipate water usage requirements more accurately especially during the Post Core Plant Startup Program.

The public health and safety was not affected since the tanks were restored to operable status within the permissible time. Also, the operating history at this point in plant start-up precludes any significant decay heat.

Attached LER 82-123 addresses this event.

If there are any questions, please contact me.

Sincerely, HSTh7 /fyt% %

Enclosure:

LER 82-123 cc:

A. E. Chaffee (USNRC Resident Inspector, San Onofre Unit 2)

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management Information & Program Control Insititue of Nuclear Power Operations (INPO)